Decibel Meter & Sound Spectrum

New in 2.0: six live instruments in iPad Control Room, a sharper Watch remote, and adaptive layouts. Free demo; live microphone use requires Pro.

Decibel Meter & Sound Spectrum turns your iPhone or iPad into a visual sound-analysis workspace for sound engineers, DJs, venue technicians, musicians, and anyone who wants to understand what they hear.

FREE TO DOWNLOAD — SIMULATED DEMO

Explore the interface with a clearly labeled simulated signal. The free demo does not turn on the microphone and is not a live measurement. Live microphone measurement and Pro tools require Spectrum Pro.

MEASURE AND SEE SOUND

• Large real-time SPL display with A, B, C, Z, and ITU-R 468 weighting • Fast, Slow, and Impulse response choices • Live Leq, Lmin, Lmax, Hold, and peak-frequency readouts • 1/3-octave RTA plus FFT, line, bars, and scrolling waterfall views • One-tap System RTA, Feedback, Hum, and Waterfall workflows • Session history, saved measurements, export, and estimated noise dose • Named calibration profiles and a guided comparison with a trusted physical meter • FIND mode for tracking a buzz, hum, feedback tone, or other narrow-band problem

CONTROL ROOM FOR IPAD

See six instruments at once from the same microphone stream: SPL/Leq/Lmin/Lmax, 1/3-octave RTA, FFT, level history, waterfall, and dose. Tap Expand for a larger view, then Close to return to the grid. Compact iPhone layouts present one instrument at a time.

The interface adapts to the available space, including large and resizable screens, Split View, and Stage Manager. Its responsive layout is ready for future dual-screen display formats.

MORE PRO WORKFLOWS

• Camera overlay with live level and peak-frequency information • Configurable loud-noise alert • Live Activity and Dynamic Island support during an active session • Optional iCloud backup for saved sessions and calibration profiles • Apple Watch companion for viewing and controlling the active iPhone session

Apple Watch is a remote for the iPhone session only. It does not use the Watch microphone and does not use HealthKit.

IMPORTANT ACCURACY LIMITS

Phone and tablet microphones are not certified sound-level instruments. Readings are estimates unless you calibrate against a trusted reference. This app does not claim IEC/ANSI Type 1 or Type 2 compliance and is not a certified dosimeter or a substitute for required occupational-safety equipment.

SPECTRUM PRO

Choose monthly or annual Spectrum Pro, or a one-time Lifetime Pro purchase. U.S. pricing is $6.99 per month, $49.99 per year, or $79.99 Lifetime; the purchase screen always shows Apple's current localized price before you buy. Existing Lifetime purchases remain unlocked, and an unexpired legacy Seven-Day Pro Pass remains honored.

Monthly and annual plans are auto-renewable subscriptions. Payment is charged to your Apple Account at confirmation. A subscription renews automatically unless canceled at least 24 hours before the end of its current period. Manage or cancel it in your Apple Account subscription settings.

PRIVACY

Microphone audio is analyzed on the device and is not recorded or uploaded. Optional iCloud backup is off by default and uses your private iCloud database. No tracking.

Privacy Policy: https://gqbunny.com/decibel-meter-sound-spectrum-privacy.php

Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/